LiNbO3-based material with enhanced red and high-penetration near-infrared mechanical luminescence properties as well as preparation method and application of LiNbO3-based material

Abstract

The invention discloses a LiNbO3-based material with enhanced red and high-penetration near-infrared mechanical luminescence properties as well as a preparation method and application thereof, and relates to the technical field of luminescent materials. The chemical formula is LiNbxTa (1-x) O3: 0.03 Pr, 0.01 Zn, and x is more than or equal to 0.5 and less than 1. By doping the Ta element, the local lattice distortion is regulated and controlled, the coordination environment of a Pr < 3 + > luminescence center is optimized, and the concentration quenching point of Pr < 3 + > is obviously delayed, so that Pr < 3 + > with higher concentration can be effectively activated without generating non-radiative cross relaxation enhancement, and synchronous enhancement of red and near-infrared mechanical luminescence is realized; the material has high brightness and deep tissue penetrating power, and a high-performance near-infrared mechanical luminescent material is provided for deep tissue biomechanical sensing.

Description

Technical Field

[0001] This invention relates to the field of luminescent materials technology, specifically to a LiNbO3-based material with enhanced red and high-penetration near-infrared mechanoluminescence properties, its preparation method, and its applications. Background Technology

[0002] Mechanoluminescence (ML) is an energy conversion phenomenon in which mechanical energy is partially or completely converted into light energy under external mechanical stimuli (including compression, tension, bending, friction, impact, or ultrasonic vibration). Its luminescence mechanism typically relies on the synergistic effect of the piezoelectric field, trapped energy levels, and luminescent centers within the material. Charge carriers are released under external force and recombine with the luminescent centers to produce radiation. Piezoelectric materials exhibiting mechanoluminescence have significant application value in stress sensing, structural health monitoring, and optical anti-counterfeiting due to their sensitive signal response and stress visualization characteristics (DongTu, et al. Adv. Mater. 2017, 1606914. Pan Zheng, et al. Adv. Funct. Mater.2025, 2505094.). However, the development of this technology currently faces two interrelated key bottlenecks: First, near-infrared mechanoluminescent materials are limited in variety and performance. Current technologies heavily rely on Cr... 3+ and Nd 3+ A few luminescent centers, including Cr. 3+ Ions can pass through 2 E g → 4 A 2g The transition produces near-infrared emission at 700–750 nm, with limited tissue penetration depth; Nd 3+ These ions can achieve multi-level transition luminescence in the 900–1100 nm wavelength range, but the intrinsically low absorption cross section and low quantum efficiency of their ff transitions limit their mechanoluminescence intensity. More importantly, apart from these two ions, the potential of other rare-earth ions in the field of near-infrared mechanoluminescence has not been fully explored and applied (Shengqiang Liu, et al. Adv. Mater. 2025, e06957; Junyang Xia, et al. Chem Eng J. 2025, 524, 169528).

[0003] On the other hand, for Pr 3+These potential ions, capable of achieving dual-mode emission in both visible and near-infrared light, face significant challenges in performance optimization within material systems. For example, the LiNbO3:Pr,Zn system disclosed in existing patent (CN 119351095 A) exhibits the following distinct defects: Limited luminescence intensity: The system itself has low mechanoluminescence intensity, which limits its detection sensitivity and application range.

[0004] Doping concentration and efficiency issues: In a LiNbO3 matrix, Pr 3+ The effective doping concentration of ions is low, and concentration quenching is prone to occur, making it impossible to further improve luminescence efficiency by increasing the doping amount.

[0005] Therefore, there is an urgent need in this field for a new technical solution that can simultaneously and significantly enhance Pr in the same material system. 3+ The mechanoluminescence intensity was increased, and its concentration quenching point was effectively delayed, thus developing a new type of mechanoluminescent material with high brightness, high tissue penetration, and good stability. Summary of the Invention

[0006] The purpose of this invention is to provide a LiNbO3-based material with enhanced red and high-penetration near-infrared mechanoluminescence properties, its preparation method, and its application, thereby solving the problems in the background technology, achieving simultaneous enhancement of red and near-infrared mechanoluminescence, and possessing both high brightness and deep tissue penetration capability, thus providing a high-performance near-infrared mechanoluminescence material for deep tissue biomechanical sensing.

[0007] This invention discloses a LiNbO3-based material with enhanced red and high-penetration near-infrared mechanoluminescence properties, wherein the chemical formula of the LiNbO3-based material is LiNb. x Ta 1-x O3: 0.03Pr, 0.01Zn, where 0.5 ≤ x < 1; Under mechanical force, it emits visible red light centered at 616 nm in the 600–650 nm band and near-infrared light centered at 893 nm in the 880–910 nm band. Moreover, the near-infrared mechanoluminescence signal can still be effectively detected after penetrating biological tissue with a thickness of more than 10 mm.

[0008] Preferred, Ta 5+ For Nb 5+ Lattice substitution was performed, which enhanced the lattice polarization effect and optimized Pr by altering the local potential field of the B-site ions. 3+ The coordination environment of the luminescent center. This structural optimization significantly delays the Pr 3+ The concentration quenching point of Pr makes higher concentrations of Pr... 3+It can be effectively activated without mutual quenching, thus cutting off Pr 3+ –Pr 3+ Non-radiative energy transfer channels between clusters. The direct result is Pr 3+ The radiative transition probability and luminous efficiency were significantly improved, ultimately achieving simultaneous and significantly enhanced emission of 616 nm visible-red light and 893 nm near-infrared light. Meanwhile, Ta... 5+ The resulting lattice distortion and redistribution of trap energy levels optimize the entire dynamic process of carrier separation, trapping, and recombination with luminescent centers within the material under stress, thereby further improving the efficiency of converting mechanical energy into light energy.

[0009] Preferably, the chemical formula of the LiNbO3-based material is LiNb 0.7 Ta 0.3 O3: 0.03Pr, 0.01Zn.

[0010] This invention also provides applications of the aforementioned LiNbO3-based materials with enhanced red and high-penetration near-infrared mechanoluminescence properties, which can be applied to the following two aspects: 1. Deep tissue biosignal detection is achieved by utilizing the 893 nm near-infrared mechanoluminescence signal generated by the LiNbO3-based material under mechanical force.

[0011] 2. By utilizing the 616 nm visible red light and 893 nm near-infrared light emitted synchronously by the material under mechanical force, stress distribution can be visualized or used as an anti-tampering label.

[0012] Preferably, the LiNbO3-based material is used to prepare a mechanoluminescent material, which is prepared by combining the LiNbO3-based material with a resin.

[0013] Preferably, the resin is an epoxy resin.

[0014] This invention also provides a method for preparing the above-mentioned LiNbO3-based material with enhanced red and high-penetration near-infrared mechanoluminescence properties, wherein the LiNbO3-based material is prepared using Li2CO3, Nb2O5, Ta2O5, and Pr6O with a purity greater than 99.9%. 11 It is prepared by high-temperature solid-state method using ZnO as raw material.

[0015] Preferably, the preparation method includes the following steps: drying the raw materials in an oven at 60-100℃ for 4-8 hours, according to the chemical formula LiNb x Ta 1-xAccurately weigh the required raw materials (O3:0.03Pr, 0.01Zn) and pour them into an agate mortar. Grind with anhydrous ethanol for 15-30 minutes. Place the well-mixed raw materials in an oven at 60-100℃ and dry for 8 minutes. Calcine the dried raw materials at 1000-1150℃ for 6-10 hours. After naturally cooling to room temperature, grind again for 5-10 minutes to obtain the final product.

[0016] Therefore, the present invention, employing the aforementioned LiNbO3-based materials, their preparation methods, and applications, possesses the following beneficial effects: (1) The material prepared by the present invention has enhanced red mechanoluminescence properties. The mechanoluminescence intensity is 700% higher than that of the sample LiNbO3:0.03Pr,0.01Zn without Ta doping, and it can stably detect the ML signal after 40 consecutive mechanical force loading.

[0017] (2) The material prepared by the present invention has high-penetration near-infrared mechanoluminescence characteristics, and can detect near-infrared mechanoluminescence signals that penetrate 5 mm of lean pork, 5 mm of fat, and 10 mm of pork tissue (5 mm of fat + 5 mm of lean pork), respectively. Furthermore, it can stably detect near-infrared ML signals after 8 consecutive mechanical loading.

[0018] (3) The material prepared by the present invention has good repeatability of mechanoluminescence properties. Under the re-irradiation of 365nm ultraviolet light, the mechanoluminescence intensity can be restored to the initial state and can maintain repeatability for 10 cycles.

[0019] (4) The preparation process of the present invention is simple. Attached Figure Description

[0020] Figure 1 LiNb prepared in Examples 1-3 and Comparative Example 1 x Ta 1-x O3:0.03Pr,0.01Zn (x=0.3, 0.5, 0.7, 1) XRD patterns; Figure 2 LiNb prepared in Examples 1-3 and Comparative Example 1 x Ta 1-x Mechanoluminescence spectrum of O3:0.03Pr,0.01Zn (x=0.3, 0.5, 0.7, 1); Figure 3 Preparation of LiNb for Example 1 x Ta 1-x Mechanoluminescence optical images of a material with O3:0.03Pr,0.01Zn (x=0.7) under a mechanical force of 30N; Figure 4 Preparation of LiNb for Example 1 x Ta1-x Near-infrared mechanoluminescence optical images of a material with O3:0.03Pr,0.01Zn (x=0.7) under mechanical loading; Figure 5 Preparation of LiNb for Example 1 x Ta 1-x Mechanoluminescence spectra of O3:0.03Pr,0.01Zn (x=0.7) material tested under biological tissue thickness conditions; Figure 6 Preparation of LiNb for Example 1 x Ta 1-x Near-infrared mechanoluminescence optical image of O3:0.03Pr,0.01Zn (x=0.7) material under a "5 mm lean meat + 5 mm fat" stack; Figure 7 Preparation of LiNb for Example 1 x Ta 1-x Mechanoluminescence variation curves of O3:0.03Pr,0.01Zn (x=0.7) material after 60s of 365nm ultraviolet light irradiation for 40 consecutive cycles; Figure 8 Preparation of LiNb for Example 1 x Ta 1-x Mechanoluminescence variation curves of O3:0.03Pr,0.01Zn (x=0.7) material after 60s of 365nm ultraviolet light irradiation over 10 cycles; Figure 9 Preparation of LiNb for Example 1 x Ta 1-x Mechanoluminescence variation curves of O3:0.03Pr,0.01Zn (x=0.7) material over 8 consecutive cycles under biological tissue of different thicknesses; Figure 10 Preparation of LiNb for Example 1 x Ta 1-x The luminescent image of the composite sample of O3:0.03Pr,0.01Zn (x=0.7) and epoxy resin after writing the letter "Pr" on the surface with a glass rod; Figure 11 LiNb was prepared for Examples 2-3 and Comparative Example 1. x Ta 1-x Mechanoluminescence spectrum of O3:0.03Pr,0.01Zn (x=0.3, 0.5, 1) material under 5 mm thick lean meat. Detailed Implementation

[0021] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0023] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art. These other embodiments are also covered within the scope of protection of this invention.

[0024] Example 1 This embodiment provides a LiNbO3-based material with the chemical formula LiNb. 0.7 Ta 0.3 O3: 0.03Pr, 0.01Zn, its preparation method and applications are as follows: Step (1) The raw materials used are Li2CO3 (purity 99.99%), Nb2O5 (purity 99.99%), Ta2O5 (purity 99.99%) and Pr6O. 11 Both ZnO (purity 99.9%) and ZnO (purity 99.99%) were dried in an oven at 60°C for 8 hours.

[0025] Step (2) according to the chemical formula LiNb x Ta 1-x O3:0.03Pr,0.01Zn (x=0.7) The required mass fraction of the components is determined by accurately weighing the raw materials and placing them into an agate mortar. The materials are then ground for 20 minutes using anhydrous ethanol as the medium. After the mixture is evenly mixed, the raw materials are dried in an oven at 60°C for 10 minutes.

[0026] Step (3) sinter the dried product at 1080℃ for 8 hours, allow it to cool naturally to room temperature, and then grind it again for 10 minutes to obtain LiNb, a mechanoluminescent material with enhanced red light emission, high-penetration near-infrared response, and stable and repeatable properties. x Ta 1-x O3:0.03Pr,0.01Zn (x=0.7).

[0027] The sample prepared in this embodiment was subjected to XRD testing, and the test results are as follows: Figure 1 As shown, LiNb 0.7 Ta 0.3 The synthesis of O3:0.03Pr,0.01Zn yielded a pure phase, matching the standard cards (LiNbO3PDF#20-0631 and LiTaO3PDF#29-0836), with no impurity phases or additional diffraction peaks detected, proving that LiNb...0.7 Ta 0.3 O3:0.03Pr,0.01Zn was successfully prepared.

[0028] In addition, to characterize the mechanoluminescence, the prepared material needs to be composited with epoxy resin using a mold to obtain a mechanoluminescent composite material. The composite steps are as follows: Step (1) Prepare epoxy resin mixture. Pour 3g of epoxy resin A glue (TJ 2221A, Truly (Suzhou) Materials Technology Co., Ltd.) and 1g of epoxy resin B glue (TJ 2221B, Truly (Suzhou) Materials Technology Co., Ltd.) into a beaker at a mass ratio of 3:1, and stir with a glass rod to mix them evenly.

[0029] Step (2) Weigh 2g of the mechanoluminescent material powder from Example 1 above, add it to the mold, press it lightly and spread it evenly to the bottom of the polytetrafluoroethylene mold (inner diameter 25mm).

[0030] Step (3) Add the mixed epoxy resin mixture into the polytetrafluoroethylene mold and let it stand at room temperature for 5 minutes until the bubbles disappear.

[0031] Step (4) Place the settled material into a 60℃ oven and keep it warm for 6 hours. Demolding will yield the bulk mechanical light-emitting composite material.

[0032] To prove LiNb 0.7 Ta 0.3 O3:0.03Pr,0.01Zn exhibits mechanoluminescence properties, and mechanoluminescence spectrum testing was conducted. The test results are as follows: Figure 2 As shown, the bulk mechanoluminescent composite material prepared in Example 1 exhibits Pr under the application of a mechanical force of 30N. 3+ The material exhibits characteristic emission bands, with the strongest emission bands at 616 nm and 893 nm. Test results show that the material of this invention displays a bright red mechanoluminescence signal, and the mechanical force loading results are as follows... Figure 3 As shown. The material of this invention exhibits a strong near-infrared mechanoluminescence signal, and the mechanical force loading results are as follows. Figure 4 As shown, Figure 4 The image is obtained by a professional near-infrared camera, which uses pseudo-color processing to convert the invisible near-infrared emission signal into green in the visible light range, so as to facilitate observation and identification in the image.

[0033] To prove LiNb 0.7 Ta 0.3 The near-infrared mechanoluminescence properties of O3:0.03Pr,0.01Zn exhibit high penetrability. Mechanoluminescence penetration tests were conducted on biological tissues, and the results are as follows: Figure 5As shown in the figure. The bulk mechanoluminescent composite material prepared in Example 1 was measured under the conditions of covering 5 mm thick lean meat, 5 mm thick adipose tissue, and a "5 mm lean meat + 5 mm adipose tissue" stack. Under the coverage of biological tissue of different thicknesses and types, the samples still showed obvious luminescence signals in the region of approximately 600 nm to 950 nm, indicating that the near-infrared mechanoluminescence of the material of the present invention can effectively penetrate approximately 10 mm of biological tissue. Its optical photographs are shown in the figure. Figure 6 As shown, it exhibits excellent optical transmittance.

[0034] To prove LiNb 0.7 Ta 0.3 The mechanoluminescence properties of O3:0.03Pr,0.01Zn are repeatable. Mechanoluminescence cyclic stability tests were conducted, and the results are as follows: Figure 7 and Figure 8 As shown, the bulk mechanoluminescent composite material prepared in Example 1 was irradiated with 365nm ultraviolet light for 60s once before testing, and a mechanical force of 30N was applied. The mechanoluminescence spectrum was continuously tested for 40 cycles. Furthermore, before each test, it was irradiated with 365nm ultraviolet light for 60s, and a mechanical force of 30N was applied. The mechanoluminescence spectrum was continuously tested for 10 cycles. The test results show that the mechanoluminescence intensity gradually decreases during the 40 consecutive cycles of testing, but the mechanoluminescence signal can still be clearly detected. When irradiated with 365nm ultraviolet light again before each test, the mechanoluminescence intensity can recover to its initial value. The material of this invention exhibits good repeatability of mechanoluminescence performance.

[0035] To prove LiNb 0.7 Ta 0.3 The stability of the near-infrared mechanoluminescence signal of O3:0.03Pr,0.01Zn was assessed by performing near-infrared mechanoluminescence response tests on the sample under multiple cyclic loading conditions. The results are as follows: Figure 9 As shown, the near-infrared mechanoluminescence intensity at approximately 893 nm emission peak was recorded under continuous mechanical loading under three conditions: 5 mm thick lean meat, 5 mm thick fat, and a "5 mm lean meat + 5 mm fat" stack. The results show that the material maintains a stable near-infrared emission signal with minimal intensity decay throughout eight consecutive loading cycles. The material of this invention exhibits excellent near-infrared mechanoluminescence signal stability and can achieve stable optical response output under multiple mechanical loads.

[0036] The LiNb prepared in Example 1 of this invention 0.7 Ta 0.3 After O3:0.03Pr,0.01Zn material was composited with epoxy resin, the letter "Pr" was written on the surface of the composite sample using a glass rod. The resulting luminescent image is shown below. Figure 10As shown, this demonstrates its value as a material for visualizing stress distribution.

[0037] Example 2 This embodiment provides a LiNbO3-based material with the chemical formula LiNb. x Ta 1-x O3:0.03Pr,0.01Zn (x=0.5), its preparation method and applications are as follows: Referring to Example 1, the difference is that the required component mass fraction in step (2) satisfies the chemical formula LiNb x Ta 1-x O3:0.03Pr,0.01Zn (x=0.5).

[0038] The sample prepared in Example 2 was subjected to XRD testing, and the test results are as follows: Figure 1 As shown, this proves that LiNb 0.5 Ta 0.5 The O3:0.03Pr,0.01Zn material was successfully prepared.

[0039] LiNb 0.5 Ta 0.5 O3:0.03Pr,0.01Zn exhibits enhanced red and near-infrared mechanoluminescence. The biological tissue penetration test method is the same as in Example 1.

[0040] The composite material prepared in Example 2 exhibits Pr under the application of a mechanical force of 30N. 3+ The characteristic emission bands are located at 616nm and 893nm, with the maximum emission bands at 616nm and 893nm, as shown in the test results. Figure 2 As shown in Figure 11, the test results indicate that the material of this invention exhibits a significant mechanoluminescence signal. The mechanoluminescence spectrum of the bulk mechanoluminescent composite material prepared in Example 2, under conditions of applying a mechanical force of 30 N and covering a 5 mm thick layer of lean meat tissue, is shown in Figure 11. A significant emission peak can be observed at approximately 616 nm, while the 893 nm near-infrared emission signal is only detected as a weak emission peak under this thickness of biological tissue coverage. The results indicate that the near-infrared mechanoluminescent tissue penetration of the bulk mechanoluminescent composite material prepared in Example 2 is weak.

[0041] Example 3 This embodiment provides a LiNbO3-based material with the chemical formula LiNb. x Ta 1-x O3:0.03Pr,0.01Zn (x=0.3), its preparation and application are as follows: Referring to Example 1, the difference is that the required component mass fraction in step (2) satisfies the chemical formula LiNbx Ta 1-x O3: 0.03Pr, 0.01Zn (x=0.3). XRD analysis was performed on the sample prepared in Example 3, and the results are as follows: Figure 1 As shown, this proves that LiNb 0.3 Ta 0.7 The O3:0.03Pr,0.01Zn material was successfully prepared.

[0042] LiNb 0.5 Ta 0.5 O3:0.03Pr,0.01Zn exhibits enhanced red and near-infrared mechanoluminescence. The biological tissue penetration test method is the same as in Example 1.

[0043] The composite material prepared in Example 3 exhibits Pr under the application of a mechanical force of 30N. 3+ The characteristic emission bands are located at 616nm and 893nm, with the maximum emission bands at 616nm and 893nm, as shown in the test results. Figure 2 As shown in Figure 11, the test results indicate that the material of this invention exhibits a significant mechanoluminescence signal. The mechanoluminescence spectrum of the bulk mechanoluminescent composite material prepared in Example 3, under conditions of applying a mechanical force of 30 N and covering a 5 mm thick layer of lean meat tissue, is shown in Figure 11. A significant emission peak can be observed at approximately 616 nm, while the 893 nm near-infrared emission signal is only detectable as a weak emission peak under this thickness of biological tissue coverage. The results indicate that the near-infrared mechanoluminescent tissue penetration of the bulk mechanoluminescent composite material prepared in Example 3 is weak.

[0044] To discuss the effect of Ta doping on the brightness of mechanoluminescent materials and their penetration into biological tissues, materials were prepared using Comparative Example 1.

[0045] Comparative Example 1 This embodiment provides a LiNbO3-based material with the chemical formula LiNbO3:0.03Pr,0.01Zn, and its preparation method is as follows: Referring to Example 1, the difference is that the required component mass fraction in step (2) satisfies the chemical formula LiNb x Ta 1-x O3: 0.03Pr, 0.01Zn (x=1). XRD analysis was performed on the sample prepared in Comparative Example 1, and the results are as follows: Figure 1 As shown, this proves that the LiNbO3:0.03Pr,0.01Zn material was successfully prepared. Figure 2The figure shows the mechanoluminescence spectrum of the composite material prepared in Comparative Example 1 under a mechanical force of 30 N. Compared with Examples 1-3, the mechanoluminescence of the composite material prepared in Comparative Example 1 is weaker. Figure 11 shows that the mechanoluminescent composite material prepared in Comparative Example 1 exhibits significantly weaker mechanoluminescence under a mechanical force of 30 N and a 5 mm thick layer of lean meat tissue.

[0046] In the above embodiments, the sample prepared in Example 1 exhibited the strongest mechanoluminescence brightness, effectively penetrating approximately 10 mm of biological tissue. Furthermore, it demonstrated good repeatability and cyclic stability; the mechanoluminescence signal remained clearly detectable after 40 consecutive cycles of testing; and after 10 cycles of mechanical force loading under 365 nm ultraviolet pre-excitation, it recovered to its initial intensity. Therefore, the preferred value is 0.5 ≤ x ≤ 1, and the most preferred value is x = 0.7.

[0047] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and does not limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A LiNbO3-based material having enhanced red color and high penetration near-infrared mechanoluminescence performance, characterized in that, The LiNbO3-based material has a chemical formula of LiNb x Ta 1-x O3: 0.03Pr, 0.01Zn, wherein 0.5≤x<1; It produces a visible red emission centered at 616 nm in the 600-650 nm band and a near-infrared emission centered at 893 nm in the 880-910 nm band under mechanical force, and the near-infrared mechanoluminescence signal can still be effectively detected after penetrating biological tissues with a thickness of more than 10 mm.

2. The LiNbO3-based material of claim 1, wherein, Ta 5+ crystal lattice of the LiNbO3 host matrix, which includes a change in the local coordination environment of the B-site ions and an increase in the local crystal field. 5+ crystal lattice of the LiNbO3 host matrix, which includes a change in the local coordination environment of the B-site ions and an increase in the local crystal field.

3. The LiNbO3-based material of claim 1, wherein, The LiNb03-based material has a chemical formula of LiNb 0.7 Ta 0.3 O3:0.03Pr,0.01Zn.

4. Use of a LiNbO3-based material having enhanced red color and high penetration near-infrared mechanoluminescence properties according to claim 1, characterized in that, The 893 nm near-infrared mechanoluminescence signal produced by the LiNbO3-based material under mechanical force is used to realize deep tissue biological signal detection.

5. Use of a LiNbO3-based material having enhanced red color and high penetration near-infrared mechanoluminescence properties according to claim 1, characterized in that, The 616 nm visible red light and 893 nm near-infrared light emissions produced by the material under mechanical force are used to realize stress distribution visualization or as an anti-tamper label.

6. Use of a LiNbO3-based material according to claim 4 or 5, characterised in that, The LiNbO3-based material is used to prepare a mechanoluminescence material, and the mechanoluminescence material is prepared by compounding the LiNbO3-based material with a resin.

7. Use of a LiNbO3-based material according to claim 6, characterised in that, The resin is an epoxy resin.

8. A method of producing a LiNbO3-based material having enhanced red color and high penetration near-infrared mechanoluminescence performance according to claim 1, characterized by, The LiNbO3-based material is prepared by using Li2CO3, Nb2O5, Ta2O5, Pr6O 11 and ZnO as raw materials through a high-temperature solid-phase method.

9. The method for preparing LiNbO3-based materials according to claim 8, characterized in that, The preparation method comprises the following steps: drying raw materials in an oven at 60-100 ℃ for 4-8 h, and placing the raw materials in a mortar, grinding for 15-30 min, and drying the mixed raw materials in an oven at 60-100 ℃ for 8 min. x Ta 1-x O3:0.03Pr,0.01Zn The required component mass fraction is accurately weighed, the raw materials are placed in a mortar with anhydrous ethanol as a medium and ground for 15-30 min, the uniformly mixed raw materials are dried in an oven at 60-100 ℃ for 8 min, and the dried raw materials are calcined at 1000-1150 ℃ for 6-10 h, and after natural cooling to room temperature, the raw materials are ground again for 5-10 min, and the product is obtained.

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